[AnticsDecoded]

Summary

• move immutable checkout and Node setup pins to their Node 24 releases
• pin CI to Ubuntu 24.04 instead of the migrating ubuntu-latest label
• align eslint-config-next with Next 16.4.1 and refresh Zod past the current high-severity advisory
• make both verification and deployment reject high-severity npm advisories

Verification

• npm ci
• npm audit --audit-level=high
• npm run check